You can create a content filtering policy that applies a specific action to messages that fail DKIM validation. To use such a policy, you should also enable DKIM validation.
See Enabling DKIM validation.
See Configuring DKIM authentication.
For an explanation of the meaning of the results that can be returned in the DKIM Authentication-Results header, see RFC 5451, Section 2.41:tools.ietf.org/html/rfc5451#section-2.4.1
To create a content filtering policy for DKIM validation
In the Control Center, click Content > Policies > Email.
Under Policy Template, ensure that the Blank radio button is selected.
Under Policy Name, type a name for your policy.
If desired, check Track violations of this policy in the dashboard and reports.
Under Conditions, click on the Apply to drop-down menu and choose Inbound messages.
Click Add to add a condition.
Click Text in this specific part of the message.
Click the drop-down menu next to Text in this specific part of the message and select Message header.
In the Header name field, type the following:
Click contains and type 1 next to or more occurrences of.
Type fail in the adjacent text entry field.
Click Add condition at the bottom of the page.
Under Actions, click the Perform the following action drop-down list and select an action to perform on messages that fail DKIM validation.
"For some actions, additional fields appear. Fill in the information as needed.
Click Add Action.
Under Apply to the following groups, check one or more groups to which you want to apply this policy.
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